THIS IS THE LITTLE MISTAKE FIX FOR RACK VERSION BOARDS ONLY. 
NOT RELEVANT FOR 51X VERSION - ALREADY FIXED. 
IF USED IN CH**R CONFIGURATION - J_CH*R SHORTED, NO HOLD CONTROL - THIS FIX IS NOT RELEVANT.
FOR USE WITH HOLD CONTROL ONLY!!!!
CUT TWO TRACES AND CONNECT 2 WIRES AS SHOWN AT PICTURES.